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commit bdcbe0922d7099ebd61d875709ea9408bc1d7543
parent a8b9ef8c1c68fbb9c89db2d8c12dca38c15e2bfd
Author: John Keeping <>
Date:   Mon,  8 Feb 2016 14:12:35 +0000

ui-stats: cast pointer before checking for zero

We abuse the "void *util" field as a counter and recently started to
cast it to a uintptr_t to avoid risking nasal demons by performing
arithmetic on a void pointer.

However, compilers are also known to do "interesting" things if they
know that a pointer is or isn't NULL.  Make this safer by checking if
the counter (after casting) is non-zero rather than checking if the
pointer is non-null.

Signed-off-by: John Keeping <>

Mui-stats.c | 4++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ui-stats.c b/ui-stats.c @@ -184,9 +184,9 @@ static void add_commit(struct string_list *authors, struct commit *commit, period->trunc(date); tmp = xstrdup(period->pretty(date)); item = string_list_insert(items, tmp); - if (item->util) - free(tmp); counter = (uintptr_t *)&item->util; + if (*counter) + free(tmp); (*counter)++; authorstat->total++;